Adsorption mechanisms of monobutyltin in clay minerals

Hermosı́n, M.C.; Martin, P.; Cornejo, J.

doi:10.1021/es00048a044

Cited by 89 publications

(46 citation statements)

References 20 publications

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“…As a consequence, if adsorption occurs via protonation, para is less favored than meta isomer. Cooperative adsorption and clustering of herbicide molecules, e.g., due to lipophilic bonds (Hermosin et al 1993), may account the "S" type isotherm. The second mechanism, taking place on Ca 2+-, K +-and Na+-clays, is hydrogen-bond formation between the ester carbonyl group of the herbicide and hydration water of metal ions, as substantiated by the shift of C=O stretch toward lower frequencies.…”

Section: Discussionmentioning

confidence: 99%

Adsorption Mechanisms of Imazamethabenz-Methyl on Homoionic Montmorillonite

Pusino

Gelsomino

Gessa

1995

Clays and clay miner.

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Almtraet --The adsorption of the herbicide imazamethabenz-methyl, a mixture of the two isomers methyl (_+)-2-[4,5-dihydro-4-methyl-4-(1 -methylethyl)-5-oxo-1H-imidazol-2-yl]-4-methylbenzoate (para isomer) and methyl (+_)-2-[4,5-dihydro-4-methyl-4-(1 -methylethyl)-5-oxo-1H-imidazol-2-yl]-5-methylbenzoate (meta isomer), from water onto AP +-, Fe 3+-, Ca 2+ -, K +-and Na+-montmorillonite was studied by analytical (HPLC) methods. The adsorption from an organic solvent was also investigated by spectroscopic (IR) and X-ray diffraction measurements. It was observed that, depending on the acidic properties of the exchangeable cations, two different mechanisms may take #ace. The first one, acting on Fe a+-and AI a+-clays, involves the protonation of the more basic nitrogen atom ofimidazolinone ring of the herbicide because of a proton transfer from the acidic metal-bound water, followed by adsorption on the clay surfaces. In this case, the clay surfaces have greater affinity for the meta than the para isomer, due to the extra-stabilization of the meta protonated form by resonance. The second mechanism, taking place on Ca 2 § -, K +-and Na +-clays, is hydrogen-bond formation between the ester carbonyl group of the herbicide and hydration water metal ions and is not affected by the structure of the isomers.

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Section: Discussionmentioning

confidence: 99%

Adsorption Mechanisms of Imazamethabenz-Methyl on Homoionic Montmorillonite

Pusino

Gelsomino

Gessa

1995

Clays and clay miner.

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“…The sorption order of the butyltin compounds into the sediments was MBT > DBT > TBT, suggesting the significant contribution of polar interaction (Sun et al 1996). Moreover, the dominant interaction of the OT compounds with the mineral surface was characterized by cation exchange (Kram et al 1989;Hermosin et al 1993;Weidenhaupt et al 1997).…”

Section: Discussionmentioning

confidence: 98%

Butyltin and phenyltin compounds in river i bay sediments of Tokyo

Baasansuren¹,

Okazaki²,

Ando³

2004

Soil Science and Plant Nutrition

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“…The tubes were protected from light and placed in a rotary shaker for 3 d at room temperature (24 -* 1 ~ to ensure that a pseudo-equilibrium was reached (Hermosin et al 1993). The pH of the suspensions was measured and reported as the pH of the equilibrium solution.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Sorption of Selected Cationic and Neutral Organic Molecules on Palygorskite and Sepiolite

Shariatmadari

Mermut

Benke

1999

Clays and clay miner.

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Abstract--Palygorskite and sepiolite show a high sorption capacity for organic molecules. Adsorption of 2 organic cations, methylene blue (MB) and crystal violet (CV), by palygorskite and sepiolite were examined. The maximum sorption of MB and CV far exceeded the cation exchange capacity (CEC) of these minerals. This shows that, besides the contribution of free negative sorption sites (P), the sites satisfied with sorption of single cations (PXi ~ and neutral sorption sites (N) on clay surfaces may contribute to the sorption of organic cations. The number of neutral sites was determined by examining the sorption of 2 neutral organic molecules, triton-X 100 (TXI00) and 15 crown ether 5 (15C5), and by application of the Langmuir isotherm.To determine the contribution of different sites, an adsorption model that applies the Gouy-Chapman equation and takes into account the formation of different clay-organic complexes in a closed system was employed. Application of this model to sorption data provided the calculation of binding coefficients for neutral sites, as well as the surface potential of the minerals at different sorbate concentrations.At sorption maxima, for both palygorskite and sepiolite, the contribution of neutral sites for sorption of organic cations was the highest, followed by the PXi ~ sites in case of CV sorption, while in sorption of MB the contribution of P-sites was the second highest. The Fourier transform infrared (FTIR) patterns of clay-organic cation complexes compared with pure clays confirm that the sorption of organic cations is by silanol groups located at the edge of fibrous crystals, which account for neutral sorption sites.

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Adsorption mechanisms of monobutyltin in clay minerals

Cited by 89 publications

References 20 publications

Adsorption Mechanisms of Imazamethabenz-Methyl on Homoionic Montmorillonite

Adsorption Mechanisms of Imazamethabenz-Methyl on Homoionic Montmorillonite

Butyltin and phenyltin compounds in river i bay sediments of Tokyo

Sorption of Selected Cationic and Neutral Organic Molecules on Palygorskite and Sepiolite

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